Property 'finally' does not exist on type 'Promise<void>'

I am trying to use the finally method on a promise but I keep getting this error.

Property 'finally' does not exist on type 'Promise<void>'.


I have looked up similar questions to this which have suggested adding "es2018.promise" to the "lib" array in tsconfig.js. This then produces the following error:

typescript error
Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'esnext', 'dom',
'dom.iterable', 'webworker', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator',
'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol',
'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string',
'es2017.intl', 'esnext.asynciterable'.


Any help resolving this is greatly appreciated!

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